package com.ithei.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.ithei.reggie.common.CustomException;
import com.ithei.reggie.dto.SetmealDto;
import com.ithei.reggie.entity.Setmeal;
import com.ithei.reggie.entity.SetmealDish;
import com.ithei.reggie.mapper.SetmealMapper;
import com.ithei.reggie.service.SetmealDishService;
import com.ithei.reggie.service.SetmealService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

@Service
@Slf4j
public class SetmealServiceImpl extends ServiceImpl<SetmealMapper, Setmeal> implements SetmealService {

    @Autowired
    private SetmealDishService setmealDishService;

    /**
     * 新增套餐，同时需要保存套餐和菜品的关系
     * 操作两张表，加上注解，要么一起成功，要么失败
     * @param setmealDto
     */
    @Transactional
    public void saveWithDish(SetmealDto setmealDto) {
        //保存套餐的基本信息，操作setmeal，执行insert操作
        this.save(setmealDto);

        //拿不到setmealDishes的id，只能遍历再赋值
        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        setmealDishes.stream().map((item)->{
            item.setSetmealId(setmealDto.getId());
            return item;
        }).collect(Collectors.toList());


        //保存套餐和菜品的关联信息，操作操作setmeal_dish，执行insert操作
        setmealDishService.saveBatch(setmealDishes);

    }


    /**
     * 删除套餐，同时需要删除套餐和菜品的关联数据
     * @param ids
     */
    @Transactional   //保证数据的一致性
    public void removeWithDish(List<Long> ids) {
        //select count(*) from setmeal where id in(1,2,3) and status = 1
        //查询套餐状态，确定是否可用删除
        LambdaQueryWrapper<Setmeal> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.in(Setmeal::getId,ids);
        queryWrapper.eq(Setmeal::getStatus,1);

        int count = this.count(queryWrapper);
        if(count > 0){
            //如果不能删除，抛出一个业务异常
            throw new CustomException("套餐正在售卖中，不能删除");
        }


        //如果可以删除，先删除套餐表中的数据----setmeal
        this.removeByIds(ids);



        //delete from setmeal_dish where setmeal_id in (1,2,3)
        LambdaQueryWrapper<SetmealDish> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.in(SetmealDish::getSetmealId,ids);

        //删除关系表中的数据----setmeal_dish
        //不能直接用 setmealDishService.removeByIds()，拿到的只是setmeal_id
        setmealDishService.remove(lambdaQueryWrapper);

    }

    /**
     * 根据id获取修改页面的信息
     * @param ids
     * @return
     */
    @Override
    public SetmealDto getByIdWithFlavor(Long ids) {
        //查询套餐信息，从setmeal表查询
        Setmeal setmeal = this.getById(ids);

        //1、普通得属性拷贝到setmealDto
        SetmealDto setmealDto = new SetmealDto();
        BeanUtils.copyProperties(setmeal,setmealDto);

        //查询当前套餐对应的菜品信息，从setmeal_dish表查询
        LambdaQueryWrapper<SetmealDish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(SetmealDish::getSetmealId,setmeal.getId());
        List<SetmealDish>   setmealDishes1  = setmealDishService.list(queryWrapper);


        //2、再把菜品setmealDishes放到setmealDto
        setmealDto.setSetmealDishes(setmealDishes1);
        return setmealDto;
    }

    /**
     *  更新套餐信息，同时更新对应的套餐菜品
     * @param setmealDto
     */
    @Transactional
    public void updateWithFlavor(SetmealDto setmealDto) {
        //更新setmeal表基本信息
        this.updateById(setmealDto);

        //清理当前菜品套餐对应的菜品数据----setmeal_dish表的delete操作
        LambdaQueryWrapper<SetmealDish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(SetmealDish::getSetmealId,setmealDto.getId());

        setmealDishService.remove(queryWrapper);

        //添加当前提交过来的菜品数据---setmeal_dish表的ins0ert操作
        List<SetmealDish> setmealDishList = setmealDto.getSetmealDishes();

        setmealDishList = setmealDishList.stream().map((item) -> {
            item.setSetmealId(setmealDto.getId());
            return item;
        }).collect(Collectors.toList());

        setmealDishService.saveBatch(setmealDishList);

    }
}
